Research On Emergency Response Strategy And Design Of Lifeline System To The Urgent Events

Lifeline system is the facilities that are necessary in public daily life and play acore role in maintaining the basic socio-economy function.It is consist of key criticalinfrastructure,generally including water system,electricity system, communicationsystem, transport system and medical system. In recent years, on the one hand avariety of emergent events occurred frequently, on the other hand,with the rapiddevelopment ofindustrialization and modernization,the critical infrastructuresubsystem tend to coupled more closed than before and in the meantime, the wholelifeline system is becoming more complex and vulnerable.Disruption or failure of one facility not only cause disruption or failure of otherfacilities in its subsystem,but also have cascading effect on other subsystems due to"domino" phenomenon which is caused of the interdependencies among thesubsystems.It may lead to paralysis of lifeline system and thereby cause great loss tothe society, economy and ecology.So the research on lifeline system emergencymanagement with consideration of complex interdependency among the subsystemsis particularly important. Based on the existing domestic and foreign relevantresearch, the paper conduct research on emergency response strategy andcomprehensive design of lifeline system to the urgent events. The main contents ofthis paper can be summarized as follows:Firstly, we summarize the concepts and characteristics of urgent events andemergency management, propose a new phase model of emergency management,describe the key task and goal in each phase.The paper alseanalyse the characteristicsand differences offoreign and domestic emergencymanagement machnism, expoundthe urgent problems to be solved in domestic emergencymanagementand theproblems this paper focused on. Secondly, in the phase of preparation, using influence matrix, the lifeline systemwith multi-system coupling and multi-level distribution is abstracted into a relation of“connections between nodes”. With an attempt to maximize the service capacity ofthe whole system, the article proposes a budged-constrained top-level design modelby taking the mutual influence between any two of the nodes into consideration.Genetic algorithm is applied to analyze the model and the results generated underdifferent circumstances demonstrate the convergence of the algorithm. Similaritiesand dissimilarities between the results are further analyzed with reference toemergency scenarios. It is hoped that the present study can be of value todecision-makers in developing strategies for system maintenance.Finally, in the phase of response, concerning the coupling feature of varioussubsystems, the lifeline system, which is composed of key critical infrastructuresubsystems, is constructed into multi-tier distributed supply chain system. In suchsystem, the relationships within subsystems are represented by network flow, and theinter-dependencies between subsystems are described through inoperabilityinput-output model. By analyzing the dynamic characteristics, available resources,and time constrains of system node repairing, a joint optimization model whichcombines emergency response strategy and real-time operational decisions isproposed. Through case study, joint emergency strategy is proved to perform betterthan individual emergency strategies. The former one can effectively reduce wastageof the whole lifeline system, providing comprehensive and effective strategy supportfor the policy maker.